Split crank bearing



Jan. 2, 1940. w. E. HUBBARD 'SPLIT CRANK BEAING Filed Jan# 24, 1959ATTORN EYS Patented Jan. 2, 11940 UNrreD STATES PAT-snr @rtreeApplication January 24, m39, :serial No. 2525683 5 Claims.

This invention relates to 'an improvement in the .connecting 'rods Iofyengines with radially 'arranged cylinders, 'and 'more particularlyconcerns the mounting of the master bearing von the crank shaft of theengine.

An important object of this invent-ion is to provide a split bearingstructure Yprovided with apertures for receiving Yconnecting bolts'disposed Vin proximity of thev center -of the lbearing structure toprovide maximum 'tightness between the lsplit bearing and the ycrank pinwhereby the bending moment yof lthe'p'in =is decreased.

And still ka *further object of this invention is to provide a splitbearing structure Asurrounding a crank pin land having a plurality ofr`apertures of varying radii from lthe axis 4of the crank pin to provide'means 1For the 4disposition of longer and shorter connecting :rodsaround the bearing.

And still another important Iobject of this linvention is to provide asplit jcrank bearing for radial engines of such kconstruct-ion that'is-more compact providing Aa strong structure of less weight, andconsequently less expensive.

Other objects and advantages of my invention will be evident from thefollowing detailed description read in conjunction with the accompanyingdrawing which illustrates one form of my new invention.

In the drawing:

Fig. 1 is a vertical sectional view of the improved split bearingstructure and connecting rod assembly.

Fig. 2 is a top view of the improved bearing structure with theconnecting rods removed.

i Fig. 3 is a detail vertical sectional view of the threaded stud forsecuring the rods to the bearing.

Referring to the drawing in detail and more particularly Fig. l. Thesplit main rod bearing 2 comprises a pair of semi-circular sections 3and 4 disposed on a crank pin 5. Interposed between the crank pin 5 andthe bearing sections 3 andl 4 is a babbitted split bearing sleeve orliner 8, dovetailed to the half sleeves 8 and III of the 4main bearing.

The split sleeve is provided with a pair of complementary outwardlyextending spaced flanges II and I2, the flanges of the two sectionsbeing detachably connected together by bolts I4. Four bolts arepreferred, arranged in parallel relation, two at each side of the crankpin 5 in order to hold the sections 3 and 4 together. A main connectingrod IB is integrally cast and rigid with the bearing section 3, and theflanges II of the latter are preferably provided with apertures to (ol.vii-58o.)

receive Apins I-B employed i-n pivotally connecting pitmans, 22, 24 and26 Vto the section 3; The complementary section -4 also has its flangesI2 provided with lapertures to receive the pins I8 which pivotallyconnect connecting -rods 2-8, '38, 32, T32! and 36 to the 'section 4. f

"It will lbe understood that all the connecting rods except the masterrod I6, are secured to and the pin I8fis a conventional bushing 42,comf,

plementary to abushing'ii'd provided in the rods.

An lannular groove fll is provided below the head 48 of Ithe pin I8, andthe angesare provided with an aperture I5l) for the reception -of `asetscrew 52 cooperating with the groove 46 to assist the lockingengagement of the pin I8. It will be understood that the bushing 42 isheld tight between the spaced flanges by the locking engagement of thepin I8.

The particular novelty of this construction is the split bearingproviding two sections in order that the crank pin may be made integralwith the Acrank shaft (not shown).

As previously mentioned the two sections 3 and 4 are held in place by aplurality ofvbolts I4. It will be obvious that if all the connectingrods were of the same length, there would be no space provided to allowpassage of the coupling bolts securing the two sections 3 vand 4together. In order to provide space for the coupling bolts I4,

some of the apertures for the pins I8 are positioned nearer the axis ofthe crank pin 5 than the remaining apertures. As vwill be apparent fromFig. 1 the apertures .for the studs or pins I8 of the connecting rods28, 28, 28 and 36 are closer to the axis of the pin 5 than are the re'-maining apertures for the `studs of the connect-` ing rods 22, 24, 30,32 and 34. With this arrangement, the `bolts i4 may readily pass throughthe anges. However, it is to be noted that the overall radii of all theAconnecting rods from the Aaxis oi the crank pin 5 is equal. This isdone by merely shortening the length of rods 28, 26, 28 and 36 tocorrespond to the amount of. space allowed for passage of the bolts. Itwill be apparent that with this construction there are four f short andsix long connecting rods` Lio Changes may be made in the combination andarrangementof parts as heretofore set forth in the specification andshown` in the drawing, it being understood that any modification in theprecise embodiment of the invention may be made Within the scope of thefollowing claims Without departing from the spirit of the invention.

What I claim is:

1. In combination with a crank shaft having a crank pin, a masterconnecting rod having split bearings surrounding said pin, means forsecuring the bearings together, said bearings provided withcomplementary spaced flangesy extending perpendicular to thelongitudinal axis of the pin, a plurality of studs connecting theilanges, a plu; rality of secondary connecting rods secured to thestuds, part of said studs disposed in the anges nearer to thelongitudinal axis of the crank pin than the remaining studs.

2. In combination with a crank shaft having a crank pin, a masterconnecting rod having split bearings surrounding said pin, said bearingsprovided With complementary spaced flanges extending perpendicular tothe longitudinal axis of the pin, a plurality of studs connecting theilanges, a plurality of secondary connecting rods secured to the studs,part of said studs disposed in the flanges nearer the longitudinal axisof the crank pin than the remaining studs, and means for securing thebearings together, said means passing through portions of the bearingsarranged between the crank pin and studs which are disposed furthestfrom the longitudinal axis of the crank pin.

3. In combination with a crank shaft having a crank pin, a masterconnecting rod having split bearings arranged around said pin, aplurality of bolts extending through the bearings for securing thebearings together, said bearings provided with complementary spacedanges extending perpendicularly to the longitudinally axis of the pin, aplurality of studs connecting the flanges, a plurality of secondaryconnecting rods secured to the studs, part of said studs disposed in theflanges nearer the longitudinal axis of the crank pin than the remainingstuds, part of said secondary connecting rods being of greater lengththan the remaining secondary connecting rods, all of said rods havingWrist pin openings at their outer ends, said openings being equidistantfrom the longitudinal axis of the crank pin.

4. In combination With a crank shaft having a crank pin, a masterconnecting rod having split bearings arranged around said pin, saidbearings provided with complementary spaced flanges extendingperpendicularly to the longitudinal axis or the pin, a plurality ofstuds connecting the anges, a plurality of secondary connecting rods-secured to the studs, part of said studs disposed in the flanges nearerthe longitudinal axis of the crank pin than the remaining studs, all ofsaid rods havingwrist pin openings at their outer ends, said openingsbeing equidistant from the longitudinal axis of the crank pin, and boltspassing through portions of thev bearings ar-` ranged between'the crankpin and studs which are disposed furthest from the longitudinal axis ofthe crank pin.

5. In combination with a crank shaft having a crank pin, a masterconnecting rod having split bearings arranged around said pin, aplurality of bolts extending through the bearings for securing thebearings together', said bearings provided vwith a pair of complementaryspaced flanges extending perpendicular to the longitu dinal axis of thecrank pin, a plurality of secondary connecting rods secured to theflanges, part of said secondary connecting rods secured to the flangesat a position farther from the longitudinal axis of the crank pin thanthe remaining secondary rods, to provide passageway for the boltssecuring the bearings together.

WILLIAM E. HUBBARD.

